Add Lua methods 'set_rotation()' and 'get_rotation()' (#7395)

Add Lua methods 'set_rotation()' and 'get_rotation()' (#7395)

* Adds Lua methods 'set_rotation()' and 'get_rotation'. Also changed some method names to be more clear. Instead of an f32 being sent over network for yaw, now a v3f is sent for rotation on xyz axes. Perserved Lua method set_yaw/setyaw so that old mods still work, other wise to set yaw they would need to switch to set_rotation(0, yaw, 0).